Grokking the Coding Interview: Patterns for Coding Questions
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Valid Perfect Square (easy)
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Problem Statement

Given a positive integer num, return true if num is a perfect square or false otherwise.

A perfect square is an integer that is the square of an integer. In other words, it is the product of some integer with itself.

You must not use any built-in library function, such as sqrt.

Examples

    • Input: 49
    • Expected Output: true
    • Justification: (7 * 7) equals 49.
    • Input: 55
    • Expected Output: false
    • Justification: There is no integer whose square is 55.
    • Input: 0

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